US20010036187A1 - Method and apparatus for providing client layer cross-connect functionality in a cross-connect or ADM - Google Patents

Method and apparatus for providing client layer cross-connect functionality in a cross-connect or ADM Download PDF

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Publication number
US20010036187A1
US20010036187A1 US09/842,730 US84273001A US2001036187A1 US 20010036187 A1 US20010036187 A1 US 20010036187A1 US 84273001 A US84273001 A US 84273001A US 2001036187 A1 US2001036187 A1 US 2001036187A1
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United States
Prior art keywords
connect
matrix
cross
board
layer cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/842,730
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English (en)
Inventor
Alberto Lometti
Livia Schweizer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent SAS
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Alcatel SA
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Filing date
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Assigned to ALCATEL reassignment ALCATEL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOMETTI, ALBERTO, SCHWEIZER, LIVIA
Publication of US20010036187A1 publication Critical patent/US20010036187A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/10—Packet switching elements characterised by the switching fabric construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/40—Constructional details, e.g. power supply, mechanical construction or backplane
    • H04L49/405—Physical details, e.g. power supply, mechanical construction or backplane of ATM switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/602—Multilayer or multiprotocol switching, e.g. IP switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/606—Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0028—Local loop
    • H04J2203/0039—Topology
    • H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5609—Topology
    • H04L2012/561—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics

Definitions

  • the present invention relates to a method and apparatus for managing, in an integrated manner, the Client Signal (or Client Layer) Cross-Connect functionality in an ADM (Add Drop Multiplexer) or XC (Cross-Connect) apparatus, in particular in ADM SDH/SONET or XC SDH/SONET equipments.
  • ADM Add Drop Multiplexer
  • XC Cross-Connect
  • the main problem is thus concerned with the management of Cross-Connect functionalities of the Client Layer, for example for data, in an SDH/SONET system of an ADM or XC type.
  • Server Layer is meant the SDH/SONET layer that carries ATM (or IP) traffic (that in this event turns out to be the “Client”).
  • the present SDH/SONET equipments performing the Cross-Connect functionality at SDH/SONET level comprise a central matrix and a plurality of input and output ports.
  • the known equipments performing the Cross-Connect functionality both at SDH/SONET level and ATM (IP) level are indeed composed of two different apparatus: one for the SDH/SONET level and one for the ATM (IP) level.
  • this solution is rather expensive, bulky and the in-field upgrading of the apparatus itself is difficult.
  • IP IP
  • SDH/SONET SDH/SONET conversion functionality
  • a further object of the present invention is to provide a method and apparatus for managing said Cross-Connect functionality at Client Layer (e.g. for data) in an efficient manner, easily in-field upgradable and rather inexpensive.
  • a further object of the present invention is to provide an apparatus for managing said cross-connect functionality which substantially is not bulkier than the devices at present in use.
  • the basic idea of the present invention is to place an SDH or SONET matrix in series with an ATM (or IP) matrix at the I/O ports of the SDH/SONET system.
  • FIG. 1 shows an apparatus for managing, in an integrated manner, the cross-connect functionality in an ADM SDH or SDXC system with “in parallel” configuration according to the prior art
  • FIG. 2 very schematically illustrates the “in series” configuration of the apparatus in accordance with the present invention
  • FIG. 3 schematically shows a first embodiment according to the present invention
  • FIG. 4 schematically shows a second embodiment according to the present invention.
  • FIG. 5 shows the apparatus of FIG. 4 in greater detail.
  • a Cross-Connect SDXC
  • ADM Virtual Containers
  • an apparatus that implements the Cross-Connect functionality comprises a support structure (sub-frame with board slots), not shown, which support structure houses: a) one or more boards on which a cross-connect matrix is located and b) a plurality of Input/Output (I/O) ports.
  • the ports are substantially logic units that can be implemented as a single board or multi boards.
  • the present invention provides for replacing at least one of the I/O ports present in the existing equipments with a board mounting a Client Layer Cross-Connect functionality matrix; such functionality comprising the termination of the Server (i.e. SDH/SONET) Layer and all the Client-related functionalities, in addition to the Client Cross-Connect functionality matrix; such functionality comprising the termination of the server (i.e. SDH/SONET) layer and all the Client-related functionalities, in addition to the Client Cross-Connect functionality.
  • This “in series” arrangement allows for the achievement of an easy in-field upgrading of the existing SDH/SONET equipments, simply by inserting the unit according to the present invention into an already available (or possibly made available) slot of the apparatus (or by replacing at least one I/O port board).
  • SDH/SONET or PDH standard I/O ports
  • SVMX SDH/SONET matrix
  • FIG. 4 A further embodiment, termed direct access configuration, is shown in FIG. 4.
  • This embodiment provides for implementing dedicated (to the Client Layer) I/O ports directly within the Client sub-matrix unit in order to increase the Input/Output capability. Physical interfaces not supported by standard I/O port units could be also implemented.
  • the ATM (IP) traffic is mapped only into SDH VC 4 s; the signal is handled exactly as it were handled by a standard SDH port.
  • Synchronous Transport Modules-N enter through the ports dedicated thereto (SDH ports or possibly SONET ports), are processed by the SDH or SONET main matrix (SVMX) able to manage both high order ( 3 , 4 ) and low order ( 1 , 2 , 3 ) Virtual Containers (VCs) and they are input to the ATM (IP) matrix (CLMX).
  • the ATM (IP) matrix suitably processes the received VCs and sends them again to the SDH/SONET main matrix (SVMX) from where they go out through the SDH/SONET or PDH ports.
  • FIG. 5 shows the direct access embodiment and the paths of the various signals in greater detail.
  • SDH ports are provided for ATM (IP) signals in level n Virtual Containers (ATM (IP) in VC-n), PDH ports are provided for 140 Mb/s high-order signals and furthermore PDH ports are provided for 2 (or 34) Mb/s low-order signals.
  • Ports which are integrated on the ATM(IP) unit for STM-I signals and dedicated ports for Ethernet signals are however provided too.
  • the meaning of the various blocks crossed by the signals can be understood from the list of acronyms given below. For the missing ones, reference should be made to the relevant Recommendations.
  • TTF Transport Terminal Function
  • EPS Equipment Protection Switching
  • HPOM Higher Path Overhead Monitoring
  • HPP Higher Path Protection
  • HPC Higher Path Connection
  • VCs Virtual Containers
  • VPs Virtual Paths
  • OSI L 2 Open System Intercommunication_-Layer 2
  • the access to the ATM matrix is performed through SDH/SONET or PDH standard interfaces (typically STM-N interfaces, 34 Mb/s and possibly 2 Mb/s interfaces).
  • SDH/SONET or PDH standard interfaces typically STM-N interfaces, 34 Mb/s and possibly 2 Mb/s interfaces.
  • PDH interfaces some SDH/SONET VCs (possibly not managed as such) are created inside the equipment in order to transport, in a transparent manner, the PDH stream from the input port to the ATM matrix. All the SDH/SONET characteristics (for instance the network protection mechanisms) on the ATM transporting streams are provided by the non-ATM portion of the equipment as occurs in an only-SDH/SONET system.
  • SDH signals indifferently SDH signals and SONET signals and any other reference to SDH should be intended as including SONET.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Graft Or Block Polymers (AREA)
  • Liquid Crystal Substances (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
US09/842,730 2000-04-28 2001-04-27 Method and apparatus for providing client layer cross-connect functionality in a cross-connect or ADM Abandoned US20010036187A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000MI000930A IT1317420B1 (it) 2000-04-28 2000-04-28 Gestione della funzionalita' di cross-connessione di livelli clientein un apparato tipo adm o xc.
ITMI2000A000930 2000-04-28

Publications (1)

Publication Number Publication Date
US20010036187A1 true US20010036187A1 (en) 2001-11-01

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US09/842,730 Abandoned US20010036187A1 (en) 2000-04-28 2001-04-27 Method and apparatus for providing client layer cross-connect functionality in a cross-connect or ADM

Country Status (5)

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US (1) US20010036187A1 (fr)
EP (1) EP1150536A3 (fr)
JP (1) JP2002009838A (fr)
CA (1) CA2345164A1 (fr)
IT (1) IT1317420B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040136383A1 (en) * 2002-12-25 2004-07-15 Nec Corporation Communication device and transport system
US20050141568A1 (en) * 2003-12-24 2005-06-30 Kwak Sung H. Apparatus for and method of integrating switching and transferring of SONET/SDH, PDH, and Ethernet signals
US20060039414A1 (en) * 2004-08-19 2006-02-23 Nec Corporation Digital modulating and demodulating device which is compatible with both PDH and SDH signals by dividing input signal in multiple directions and combining input signals from multiple directions with matrix switching unit
US20060133366A1 (en) * 2004-12-17 2006-06-22 Michael Ho Cascaded connection matrices in a distributed cross-connection system
US20060245450A1 (en) * 2005-04-28 2006-11-02 Lucent Technologies Inc. Method and apparatus for synchronous switching of optical transport network signals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816747A1 (de) * 1988-05-17 1989-11-30 Standard Elektrik Lorenz Ag Leistungsvermittelnde paket-vermittlungseinrichtung
GB9405993D0 (en) * 1994-03-25 1994-05-11 Plessey Telecomm Multipurpose synchronous switch architecture
US5526344A (en) * 1994-04-15 1996-06-11 Dsc Communications Corporation Multi-service switch for a telecommunications network
JP2000013387A (ja) * 1998-06-22 2000-01-14 Fujitsu Ltd 非同期通信網の交換機能を備えた同期通信網伝送装置

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040136383A1 (en) * 2002-12-25 2004-07-15 Nec Corporation Communication device and transport system
US20050141568A1 (en) * 2003-12-24 2005-06-30 Kwak Sung H. Apparatus for and method of integrating switching and transferring of SONET/SDH, PDH, and Ethernet signals
US7599372B2 (en) * 2003-12-24 2009-10-06 Electronics And Telecommunications Research Institute Apparatus for and method of integrating switching and transferring of SONET/SDH, PDH, and Ethernet signals
US20060039414A1 (en) * 2004-08-19 2006-02-23 Nec Corporation Digital modulating and demodulating device which is compatible with both PDH and SDH signals by dividing input signal in multiple directions and combining input signals from multiple directions with matrix switching unit
US7551642B2 (en) * 2004-08-19 2009-06-23 Nec Corporation Digital modulating and demodulating device which is compatible with both PDH and SDH signals by dividing input signal in multiple directions and combining input signals from multiple directions with matrix switching unit
US20060133366A1 (en) * 2004-12-17 2006-06-22 Michael Ho Cascaded connection matrices in a distributed cross-connection system
US7602777B2 (en) * 2004-12-17 2009-10-13 Michael Ho Cascaded connection matrices in a distributed cross-connection system
USRE45248E1 (en) * 2004-12-17 2014-11-18 Micron Technology, Inc. Cascaded connection matrices in a distributed cross-connection system
USRE47959E1 (en) * 2004-12-17 2020-04-21 Micron Technology, Inc. Cascaded connection matrices in a distributed cross-connection system
US20060245450A1 (en) * 2005-04-28 2006-11-02 Lucent Technologies Inc. Method and apparatus for synchronous switching of optical transport network signals
US7711007B2 (en) * 2005-04-28 2010-05-04 Alcatel-Lucent Usa Inc. Method and apparatus for synchronous switching of optical transport network signals

Also Published As

Publication number Publication date
ITMI20000930A0 (it) 2000-04-28
JP2002009838A (ja) 2002-01-11
ITMI20000930A1 (it) 2001-10-28
IT1317420B1 (it) 2003-07-09
CA2345164A1 (fr) 2001-10-28
EP1150536A3 (fr) 2002-01-02
EP1150536A2 (fr) 2001-10-31

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Owner name: ALCATEL, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LOMETTI, ALBERTO;SCHWEIZER, LIVIA;REEL/FRAME:011933/0997

Effective date: 20010523

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION